Semiconductor integrated circuit for wireless communication

Details Semiconductor integrated circuit for wireless communication Semiconductor integrated circuit for wireless communication

2007-11-27

2007-11-27

Lee, Benny (Department: 2817)

Oscillators

With frequency adjusting means

Step-frequency change

C331S014000, C331S025000, C455S260000

Reexamination Certificate

active

11178511

ABSTRACT:
A semiconductor integrated circuit with a PLL (Phase Locked Loop) built therein is used in a semiconductor integrated circuit for wireless communication. The PLL circuit generates an oscillation signal having a predetermined frequency, which is combined with a receive signal or a transmit signal for wireless communication. The PLL circuit includes a VCO capable of switching an oscillation frequency band, a variable divider, a loop filter and a phase comparator. An oscillation frequency of the VCO is controlled according to the difference in phase between a signal obtained by dividing the output of the VCO and a reference signal, and a discrimination circuit makes a decision as to a lead or delay of the phase of an output of the variable divider with respect to a reference signal having a predetermined frequency. An auto band selection circuit generates a signal for selecting a frequency band for the VCO.

REFERENCES:
patent: 6563387 (2003-05-01), Hirano et al.
patent: 6993307 (2006-01-01), Welland et al.
patent: 7123102 (2006-10-01), Uozumi et al.
patent: 7148764 (2006-12-01), Kasahara et al.
patent: 2003-152535 (2003-05-01), None

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